ABC News notes that Bremer Trust was forced to drill open the vault as only Prince knew the key code. Inside they discovered enough unreleased music to release a new album every year for the next century.

According to Prince’s former sound engineer, Susan Rodgers, the vault pre-dates the release of 1984’s Purple Rain. “When I left in 87, it was nearly full,” she explained in an interview with the Guardian. “Row after row of everything we’d done. I can’t imagine what they’ve done since then.”